Qt-5.0.2-Mingw47_32 + Qwt-6.1.0-svn: Error while running examples

Hi guys,
Just now, I have installed Qt5.0.2-Mingw47_32 on Windows 7. I also successfully compiled Qwt-6.1.0-svn using Qt's console. I have done all the required pre-installation and post-installation work like setting environment variables of Qt and Qwt. Everything went fine, but when I tried to execute examples of Qwt from "C:\Qwt-6.1.0\examples\bin". I am getting the following error.

Attachment 8970

What I understood from this error is: Qwt examples are not able to find that required function in Qt5OpenGL.dll. I have set Qt's environment variables properly. I also have tried build Qwt with examples (which is default) in both the modes but the error remains the same (in debug mode it refers Qt5OpenGLd.dll). I also tried to link Qt libraries of Qt Creator instead of Qt libraries of Mingw. But error remains same. Whats going wrong? Bug in Qt5.0.2-Mingw version (dlls)?

Thanks in advance.

swamy.